Current PerspectiveHyperthermia adds to chemotherapy☆
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Hyperthermia or heat shock exposure: Arrhenius relationships from the molecule and cell to the clinic
Hyperthermia can be defined as controlled temperature elevation by targeting the heating field to the malignant tumour as well as the surrounding tissue, organ, part of body or even to the whole body. Following the results of profound research starting in the early 1970s for exponentially growing cells when exposed to heat shock above a threshold temperature – in general – a strict temperature–time relationship was noted. This is specific for the individual cell line, and different in the
Enhancement of drug cytotoxicity by hyperthermia: its reality at clinically relevant temperatures
Heat modifies the cytotoxicity of many chemotherapeutic agents (see Table 1).8, 9, 10, 11, 12, 13 The extent of ‘thermal chemosensitisation’ both in vitro and in vivo can be quantified by the quotient of the clonogenic cell growth or tumour cell growth or tumours treated either with the drug alone or with the same drug at elevated temperature. The thermal enhancement ratios (TER) for certain antineoplastic agents at two different temperatures (41.5 °C versus 43.5 °C, respectively) are given in
Cell lethality and oncogenic potential: what do we pay for the enhancement?
Heat could theoretically enhance both the cytotoxic and oncogenic potential of the drugs. Examination of transformation incidences expressed as a function of surviving fraction showed that for a given level of cell killing the combination of heat and, e.g. cisplatinum resulted in fewer transformants per surviving cell than for cisplatinum alone.19 Chemotherapy behaves in a manner similar to X-rays combined with heat, i.e. heat appears to convert sublethal damage to lethal damage, thus reducing
Hyperthermia as targeted therapy: perspective for delivery of anticancer agents
For those drugs which show temperature-dependent enhancement, the rationale for their combined application is that hyperthermia ‘targets’ the action of the chemotherapeutic agent within the tumour region with elevated temperatures without affecting systemic toxicity. There are new biological aspects that have to be transferred into clinical research.26 Hyperthermia can be used to enhance the delivery of drugs to the volume targeted by heat. However, microvascular damage that is caused by
Hyperthermia combined chemotherapy-induced necrosis: the role of released HSP and the immune response
The antineoplastic properties of chemotherapeutic agents are mainly based upon their ability to induce either a necrotic or apoptotic programmed cell death. Whereas necrosis is marked by a passive pathological cell damage followed by an inflammatory response, apoptosis represents a genetically controlled, active death programme.36, 37 Heat treatment induces both, apoptosis and necrosis, and the form of death changes from apoptosis to necrosis above a certain threshold temperature.38, 39 The
Combination trials: clinical application and results
The current interest in hyperthermia came into the limelight again in the beginning of 2000, where the medical community started re-addressing both the biological and clinical usefulness of this modality.58, 59, 60, 61 For many years, it has been an unproven dogma in hyperthermia research that antineoplastic heat action requires temperatures >43 °C in the clinic. The thermal isoeffect dose (TID) concept based upon pre-clinical in vitro results was – in simple analogy – transferred into the
Clinical aspects for future directions
In the past decade, combined use of local hyperthermia and radiation compared to radiation alone has clearly been shown to have clinical potential for relatively ‘superficial’ malignant tumours92, 93 in the appropriate situation, especially in recurrent breast cancer,94 both in terms of response rate and local control. At present, we are witnessing the coming of age for regional ‘deep’ hyperthermia (RHT, PBH and HIPEC) as a new treatment component for malignancies in general and if combined
Conflict of interest statement
None declared.
Acknowledgements
Thanks to Lars Lindner, Katharina Tschoep, Valeria Milani and Elfriede Noessner for their suggestions and critical and insightful comments on the manuscript and to Martina Lahm for her writing assistance.
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Source of support: Helmholtz Gemeinschaft Deutscher Forschungszentren – VH-VI-140 Clinical Hyperthermia and Related Technology SFB455 – Virale Funktionen und Immunmodulation Deutsche Krebshilfe e.V.